If you like playing slots, the Stake vs Eddie is a better promotion than slot forum challenge (non-VIP).
Why I say better, because the minimum bet is lower $0.1 only while the slot forum challenge is $0.2.
Of course in order to get the reward, we should be beat the chosen multiplier (mostly above 600x) but it is basically the same situation with the forum challenge where you need to be on top 20 to get bigger reward.
Here is the reward for the latest Stake vs Eddie challenge:

The reward from the previous one was around $80+, so basically it is better because the reward is bigger than the slot forum challenge with 50% smaller minimum bet.
You should consider to participate on it IMO but if you are not interested then it is good for others because the less players hit the minimum multiplier = the bigger reward we may get LOL.